A method of concealing temporal shifts when a digital video effects system is used with a video switcher adds a mixer to the digital video effects system to mix the input to and output from the digital video effects system if the image to be transformed is on-screen at the beginning of the effect. An input video signal from a keyer in the video switcher is switched by an effects send/return matrix to the inputs of the digital video effects system and the mixer, and the output from the mixer is returned to the effects send/return matrix for input to the mix/effects stage of the video switcher. When the digital video effects system is bypassed, a delay circuit is used in the bypass path of the effects send/return matrix, the delay time equaling the processing time of the mixer.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An apparatus for concealing temporal shifts when a digital video effects system is used with a video switcher comprising: a mixer coupled to mix the input to and output from the digital video effects system when an effects send/return path is used by the video switcher; and a delay circuit coupled to bypass the effects send/return path when the digital video effects system is not used with the video switcher.
2. An improved apparatus of the type having a video switcher with an effects send/return matrix for interacting with a digital video effects system wherein the improvement comprises means for mixing a video signal for input to the digital video effects system from the video switcher via the effects send/return matrix with an output signal from the digital video effects system for return to the video switcher via the effects send/return matrix.
3. The apparatus as recited in claim 2 further comprising means for delaying the video signal when the digital video effects system is bypassed by the effects send/return matrix by an amount equal to the processing time of the mixing means.
4. A method of concealing temporal shifts when a digital video effects device is used with a video switcher comprising the steps of: selectively routing a video signal from the video switcher to the digital video effects device and to a mixer; mixing in the mixer the video signal with a transformed video signal from the digital video effects device to produce a processed video signal; and returning the processed video signal to the video switcher.
5. The method as recited in claim 4 further comprising the step of delaying the video signal when the digital video effects device is bypassed by an amount equal to the processing time of the mixing step.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
July 22, 1999
July 10, 2001
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